nesting frames

html_iframe.js

// Security Error: Content at about:srcdoc may not load or link to resource://jid1-pss5nuwzdn1n3a-at-jetpack/signals/data/index.html.

let XUL_NS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
let HTML_NS = "http://www.w3.org/1999/xhtml";

let toolbar = document.createElementNS(XUL_NS, "toolbar");
toolbar.setAttribute("collapsed", false);
toolbar.setAttribute("style", "height: 80px;");

let toolbox = document.getElementById("navigator-toolbox");
toolbox.appendChild(toolbar);

let iframe = document.createElementNS(HTML_NS, "iframe");
iframe.setAttribute("srcdoc", "<iframe src='resource:///chrome/browser/content/browser/aboutRobots.xhtml'/>");
// type isn't recognized by HTML iframes so we set a sandbox instead.
// iframe.setAttribute("type", "content");
iframe.setAttribute("sandbox", "allow-scripts");
iframe.setAttribute("mozbrowser", "");

// transparen isn't recognized by HTML iframes so we set seamless instead.
// iframe.setAttribute("transparent", true);
iframe.setAttribute("seamless", "");
toolbar.appendChild(iframe);

// Doesn't work:
// Security Error: Content at moz-nullprincipal:{9df928d4-a39a-9743-a48a-270066d14810}
// may not load or link to resource:///chrome/browser/content/browser/aboutRobots.xhtml.

more-attempts.js

let XUL_NS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
let HTML_NS = "http://www.w3.org/1999/xhtml";

let toolbar = document.createElementNS(XUL_NS, "toolbar");
toolbar.setAttribute("collapsed", false);
toolbar.setAttribute("style", "height: 80px;");

let toolbox = document.getElementById("navigator-toolbox");
toolbox.appendChild(toolbar);

let iframe = document.createElementNS(HTML_NS, "iframe");
iframe.setAttribute("srcdoc", "<iframe src='resource:///chrome/browser/content/browser/aboutRobots.xhtml'/>");
//iframe.setAttribute("src", "resource:///chrome/browser/content/browser/aboutRobots.xhtml")
// type isn't recognized by HTML iframes so we set a sandbox instead.
// iframe.setAttribute("type", "content");
//iframe.setAttribute("sandbox", "allow-scripts ");
iframe.setAttribute("mozbrowser", "");
//iframe.setAttribute("mozframetype", "content")

// transparen isn't recognized by HTML iframes so we set seamless instead.
// iframe.setAttribute("transparent", true);
iframe.setAttribute("seamless", "");
toolbar.appendChild(iframe);

iframe.contentWindow

works.js

let XUL_NS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
let HTML_NS = "http://www.w3.org/1999/xhtml";

let toolbar = document.createElementNS(XUL_NS, "toolbar");
toolbar.setAttribute("collapsed", false);
toolbar.setAttribute("style", "height: 80px;");

let toolbox = document.getElementById("navigator-toolbox");
toolbox.appendChild(toolbar);

let iframe = document.createElementNS(HTML_NS, "iframe");
// iframe.setAttribute("srcdoc", "<iframe src='resource:///chrome/browser/content/browser/aboutRobots.xhtml'/>");
iframe.setAttribute("src", "resource:///chrome/browser/content/browser/aboutRobots.xhtml")
// type isn't recognized by HTML iframes so we set a sandbox instead.
// iframe.setAttribute("type", "content");
iframe.setAttribute("sandbox", "allow-scripts");
iframe.setAttribute("mozbrowser", "");

// transparen isn't recognized by HTML iframes so we set seamless instead.
// iframe.setAttribute("transparent", true);
iframe.setAttribute("seamless", "");
toolbar.appendChild(iframe);

// Works but we no longer have intended nesting.

xul_iframe.js

// Security Error: Content at about:srcdoc may not load or link to resource://jid1-pss5nuwzdn1n3a-at-jetpack/signals/data/index.html.

let XUL_NS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
let HTML_NS = "http://www.w3.org/1999/xhtml";

let toolbar = document.createElementNS(XUL_NS, "toolbar");
toolbar.setAttribute("collapsed", false);
toolbar.setAttribute("style", "height: 80px;");

let toolbox = document.getElementById("navigator-toolbox");
toolbox.appendChild(toolbar);

let iframe = document.createElementNS(XUL_NS, "iframe");
iframe.setAttribute("srcdoc", "<iframe src='resource:///chrome/browser/content/browser/aboutRobots.xhtml'/>");
iframe.setAttribute("type", "content");
iframe.setAttribute("transparent", true);
iframe.setAttribute("style", "border: 1px solid red");

toolbar.appendChild(iframe);

// Not going to work because xul iframe does not supports content type iframes